Related Manuals for LG MC-8483NL
Summary of Contents for LG MC-8483NL
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Page 1: Microwave Oven
Website http://biz.lgservice.com MICROWAVE OVEN SERVICE MANUAL MODEL: MC-8483NL CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. September, 2004 P/NO : 3828W5S6029 Printed in Korea... -
Page 2: Safety Precautions
SAFETY PRECAUTIONS This device is to be serviced only by properly qualified service personnel. Consult the service manual for proper service procedures to assure continued safety operation and for precautions to be taken to avoid possible exposure to excessive microwave energy. PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY... -
Page 3: Table Of Contents
CONTENTS (Page) SAFETY PRECAUTIONS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Inside front cover SPECIFICATIONS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1-1 CAUTIONS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2-1 INSTALLATIONS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 3-1... -
Page 4: Specifications
SPECIFICATIONS ITEM DESCRIPTION MODEL MC-8483NL Power Requirement 230/240 Volts AC 50 Hz Single phase, 3 wire grounded Microwave 1350W Grill 1250W Convection 1650W Power Output 950 Watts full microwave power (IEC60705) Microwave Frequency 2450 MHz ± 50 MHz Magnetron 2M246 - 050GT Timer 0 ~ 99 min. -
Page 5: Cautions
CAUTIONS Unlike other appliances, the microwave oven is MICROWAVE RADIATION high-voltage and high-current equipment. Personnel should not be exposed to the Though it is free from danger in ordinary use, microwave energy which may radiate from the extreme care should be taken during repair. magnetron or other microwave generating device if it is improperly used or connection. -
Page 6: Installations
INSTALLATIONS BEFORE YOU BEGIN, READ THE FOLLOWING INSTRUCTIONS COMPLETELY AND CAREFULLY. INSTALLING EARTHING INSTRUCTIONS 1. Empty the microwave oven and clean inside it with This microwave oven is designed to be used in a fully a soft, damp cloth. Check for damage such as earthed condition. -
Page 7: Operating Instructions
OPERATING INSTRUCTIONS FEATURES Oven Front Plate Window Door Screen Door Seal Steamer Control Panel STEAM COVER Safety Door Lock System STEAM PLATE Turntable STEAM WATER BOWL (Metal Tray) Roller Rest High Rack Low Rack CONTROL PANEL 1. DISPLAY WINDOW: Used to show time of day, cooking of power level, cooking category. -
Page 8: Operating Sequence
OPERATING SEQUENCE The following is a description of component functions 8. SPEED HOT AIR during oven operation. To pre-heat Stop/ Select Desired convection 1. SETTING THE CLOCK Start Clear Speed hot air temp (100°C~250°C) Custom Desired Stop/Clear Clock To cook hour Stop/ Select... -
Page 9: Schematic Diagram
SCHEMATIC DIAGRAM... -
Page 10: Circuit Description
CIRCUIT DESCRIPTION GENERAL DETAILS WHEN THE OVEN IS SET AT ANY LEVEL EXCEPT MAXIMUM. • The low voltage transformer supplies the necessary voltage to the micom controller when power cord is • The micom controller controls the ON-OFF time of relay 2 plugged in. -
Page 11: Service Information
SERVICE INFORMATION TOOLS AND MEASURING INSTRUMENTS NECESSARY TOOLS NECESSARY MEASURING INSTRUMENTS Tools normally used for TV servicing are sufficient. • TESTER(VOLTS-DC, AC., Ohmmeter) Standard tools are listed below. • Microwave survey meter • Diagonal pliers - Holaday HI-1500 • Long nose pliers HI-1501 •... -
Page 12: Record Keeping And Notification After Measurement
MEASUREMENT WITH OUTER CASE NOTES WHEN MEASURING REMOVED • Do not exceed meter full scale deflection. • The test probe must be removed no faster than • When you replace the magnetron, measure for 1 inch/sec (2.5 cm/sec) along the shaded area, microwave energy leakage before the outer case is otherwise a false reading may result. -
Page 13: Measurement Of Microwave Power Output
MEASUREMENT OF MICROWAVE POWER OUTPUT • Microwave power output measurement is made with • The microwave power output P in watts is calculated the microwave oven supplied at its rated voltage and from the following formula : operated at its maximum microwave power setting 4187 x (∆T) + 0.55 X (T )X M... - Page 14 E. DOOR GROSS ASSEMBLY REMOVAL G. MAGNETRON REMOVAL 1) Open the door. 1) Disconnect the leadwire from the high voltage 2) Remove the choke cover very carefully with a flat- transformer and high voltage capacitor. blade screwdriver. 2) Carefully remove the mounting screws holding the CAUTION: Be careful not to damage door seal magnetron and the waveguide.
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Page 15: Diode Removal
H. FAN MOTOR ASSEMBLY REMOVAL K. THE TURNTABLE MOTOR REMOVAL 1) Discharge the high voltage capacitor. 1) Remove the turntable. 2) Disconnect the leadwire from fan motor, noise filter 2) Remove the turntable shaft VERY CAREFULLY and high voltage capacitor. with a slotted screwdriver. - Page 16 L. C-MOTOR, THERMISTOR AND M. INTERLOCK SYSTEM SHEATH HEATER REMOVAL 1) INTERLOCK MECHANISM The door lock mechanism is a device which has 1) Remove the two screws securing the cover been specially designed to eliminate completely assembly to the oven cavity. microwave activity when the door is opened during 2) Disconnect the leadwire from the circulation motor cooking and thus to prevent the danger resulting...
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Page 17: Interlock Continuity Test
INTERLOCK CONTINUITY TEST WARNING : FOR CONTINUED PROTECTION AGAINST EXCESSIVE RADIATION EMISSION, REPLACE ONLY WITH IDENTICAL REPLACEMENT PARTS. TYPE NO. SZM-V 16-FA-63 OR VP-533A-OF FOR PRIMARY SWITCH TYPE NO. SZM-V 16-FA-62 OR VP-532A-OF FOR MONITOR SWITCH TYPE NO. SZM-V 16-FA-63 OR VP-533A-OF FOR SECONDARY SWITCH B. -
Page 18: Component Test Procedure
COMPONENT TEST PROCEDURE CAUTIONS 1. DISCONNECT THE POWER SUPPLY CORD FROM THE OUTLET WHENEVER REMOVING THE OUTER CASE FROM THE UNIT. PROCEED WITH THE TEST ONLY AFTER DISCHARGING THE HIGH VOLTAGE CAPACITOR AND REMOVING THE WIRE LEADS FROM THE PRIMARY WINDING OF THE HIGH VOLTAGE TRANSFORMER. - Page 19 COMPONENTS TEST PROCEDURE RESULTS Antenna Gasket Chassis Filament Terminals NOTE: When testing the magnetron, be sure to install the magnetron gasket in the correct position and be sure that the gasket is in good condition. HIGH VOLTAGE Measure the resistance. Normal: Momentarily indicates CAPACITOR (Ohm-meter scale: Rx1000)
- Page 20 COMPONENTS TEST PROCEDURE RESULTS FUSE Check for continuity of the fuse with an Normal Abnormal multi-meter. NOTE: If the fuse is blown, check the primary, the secondary, and the monitor switches, H.V.D. and H.V.C. before replacing the fuse. If the fuse is blown by improper switch operation replace the defective switch and the fuse at the same time.
- Page 21 COMPONENTS TEST PROCEDURE RESULTS Cooking Start Disconnect the 9 pin Check for P.C.B. connector. connector from P.C.B. (Refer to schemetic diagram) 1 2 3 4 5 6 7 8 9 Cooking Start RELAY 2, RELAY 3 OF P.C.B. Relay 3 (Wire leads removed.) Note:Relay Relay 1: Fan motor...
- Page 22 COMPONENTS TEST PROCEDURE RESULTS Normal : COM-230V : Approx. 150 Ω CIRCULATION MOTOR (Wire leads removed) Abnormal : Infinite or several ohm. 230V(BL) NOTE: (YL) ) = WIRE COLOR Cooking Start RELAY 1, 4, 6 OF P.C.B (Disconnect the 9 pin connector from P.C.B) See Schematic Dagram on Relay 1...
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Page 23: Trouble Shooting
TROUBLE SHOOTING WHEN YOU GET A COMPLAINT FROM YOUR CUSTOMER, EVALUATE THE COMPLAINT CAREFULLY. IF THE FOLLOWING SYMPTOMS APPLY, PLEASE INSTRUCT THE CUSTOMER IN THE PROPER USE OF THE MICROWAVE OVEN. THIS CAN ELIMINATE AN UNNECESSARY SERVICE CALL. CAUTIONS 1. Check grounding before checking for trouble. 2. - Page 24 (TROUBLE 1) The following visual conditions indicate a probable defective control circuit. 1. Incomplete segments. • Segment missing. • Partial segment missing. • Digit flickering (NOTE: Slight flickering is normal.) 2. Colon does not turn on or blink. 3. A distinct change in the brightness of one or more numbers in display. 4.
- Page 25 (TROUBLE 2) Oven does not operate at all ; Display window does not display any figures and no input is accepted. CONDITION CHECK RESULT CAUSE REMEDY Replace primary Malfunction of the Check continuity 1. Fuse blows. Continuity. and monitor monitor switch. of monitor switches.
- Page 26 (TROUBLE 3) Display shows all figures set, but oven does not start cooking while desired program times are set and START pad is touched. CONDITION CHECK RESULT CAUSE REMEDY Replace Defective Check continuity 1.Setting time does No continuity. secondary switch. secondary switch.
- Page 27 (TROUBLE 5) No microwave oscillation even though oven lamp and fan motor run (Display operates properly) CONDITION CHECK RESULT CAUSE REMEDY Defective P.C.B No microwave Disconnect the Replace P.C.B No continuity. oscillation. wire leads from assembly assembly relay 2 and check continuity Continuity.
- Page 28 (TROUBLE 6) Oven does not cook properly when programmed for the set power level (Operates properly on HIGH) CONDITION CHECK RESULT CAUSE REMEDY Output is full when Defective P.C.B. Replace P.C.B. Disconnect the Abnormal. you set lower assembly. assembly. wire leads from power level.
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Page 29: Exploded View
#EV# EXPLODED VIEW INTRODUCTION OVEN CAVITY PARTS INTERIOR PARTS DOOR PARTS BASE PLATE PARTS LATCH BOARD PARTS CONTROL PANEL PARTS -6-1-... -
Page 30: Door Parts
#EV# DOOR PARTS 13581A 15006A Model No. DESCRIPTION (DOOR FRAME) * CHANGED THE PART IN THE SECTION OR CIRCUIT - DOOR FRAME & SEAL TAPE (Stock New Parts) 13552A 13213A * NSP 13551A 14026A WTT030 13650A 14970A WTT024 14980A * NSP: NOT SERVICE PARTS -6-2-... -
Page 31: Control Panel Parts
#EV# CONTROL PANEL PARTS 24781S 268711 WTP004 23551A 250201 249401 23520A 23790D WTP015 243501 249402 250202 -6-3-... -
Page 32: Oven Cavity Parts
#EV# OVEN CAVITY PARTS WTT022 33112U WTT022 WTT029 33651A 33052M 33550S 35026S 33390M 36549S 35026C WTP013 35026G 33390G 35889A -6-4-... - Page 33 #EV# LATCH BOARD PARTS WSZ085 43501A 466001 43500A 466003 44510A 466001 -6-5-...
- Page 34 #EV# INTERIOR PARTS • WSZ002 568771 WTT021 56411A WTT022 350123 34810H Button Head WTT021 33808A 56930V WTT022 35300A 56322A 535041 WTT028 WSZ059 WTT022 WMT002 36549C WSZ185 34930W 348102 55900N 348103 54350S 54810S WWZ085 54620A WNH002 WTT021 535042 WWS005 55900C 35300S 56208A WTT029 348101...
- Page 35 #EV# BASE PLATE PARTS 56170D 63302A 63303A WTT028 948502 647781 WTT021 WTT030 WSZ002 -6-7-...